It's unfortunate that Sage don't bother leaving their old SDKs on their site since they take up so little storage space.  I have been looking everywhere on the Internet for Sage 50's SDK for version 2018.3 or 2019.0 (either one will work for my purposes).  Would anyone have one of those two versions that they could share with me?

When I asked Sage, they told me that the customer needs to upgrade (although their setup will not benefit from an upgrade).

Any help would be appreciated.

Michael